#define ECHO_PIN 2
#define TRIG_PIN 3

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);

  int durasi = pulseIn(ECHO_PIN, HIGH);
  float jarak = durasi * 0.034 / 2;

  //float y = (-7E-07*jarak*jarak)+(1.0063*jarak)-0.0256;
  float y = (-6E-07*jarak*jarak)+(1.0063*jarak)-0.0256;
  Serial.print("Jarak : ");
  Serial.print(jarak);
  Serial.print(", Jarak Kalibrasi : ");
  Serial.println(y);
  
  delay(100);
}